Cheap flights from Seattle to Milton Keynes from CA $314

View CA $314 flight on Sun, Oct. 5, 2025Opens in a new window

Popular airlines from Seattle to Milton Keynes

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Cheap flights from Seattle (SEA) to Milton Keynes (LON)

Prices were available within the past 7 days and start at CA $314 for one-way flights and CA $655 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Aer Lingus
Mon, Oct. 20 - Wed, Nov. 19
SEA
Seattle
LHR
London
CA $655 Roundtrip, found 16 hours ago
CA $655
Roundtrip
found 16 hours ago
Select Aer Lingus flight, departing Mon, Oct. 20 from Seattle to London, returning Wed, Nov. 19, priced at CA $655 found 16 hours ago
American Airlines
Wed, Aug. 6 - Thu, Aug. 21
SEA
Seattle
LHR
London
CA $666 Roundtrip, found 15 hours ago
CA $666
Roundtrip
found 15 hours ago
Select American Airlines flight, departing Wed, Aug. 6 from Seattle to London, returning Thu, Aug. 21, priced at CA $666 found 15 hours ago
Virgin Atlantic
Tue, Oct. 21 - Wed, Nov. 5
SEA
Seattle
LHR
London
CA $695 Roundtrip, found 3 days ago
CA $695
Roundtrip
found 3 days ago
Select Virgin Atlantic flight, departing Tue, Oct. 21 from Seattle to London, returning Wed, Nov. 5, priced at CA $695 found 3 days ago
Delta
Tue, Oct. 21 - Wed, Nov. 5
SEA
Seattle
LHR
London
CA $695 Roundtrip, found 3 days ago
CA $695
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Oct. 21 from Seattle to London, returning Wed, Nov. 5, priced at CA $695 found 3 days ago
Air France
Tue, Oct. 21 - Wed, Nov. 5
SEA
Seattle
LHR
London
CA $695 Roundtrip, found 3 days ago
CA $695
Roundtrip
found 3 days ago
Select Air France flight, departing Tue, Oct. 21 from Seattle to London, returning Wed, Nov. 5, priced at CA $695 found 3 days ago
KLM
Tue, Oct. 21 - Wed, Nov. 5
SEA
Seattle
LHR
London
CA $697 Roundtrip, found 3 days ago
CA $697
Roundtrip
found 3 days ago
Select KLM flight, departing Tue, Oct. 21 from Seattle to London, returning Wed, Nov. 5, priced at CA $697 found 3 days ago

Find the cheapest month to fly from Seattle (SEA) to London (LHR)

October is typically the cheapest month to fly

From CA $659 - CA $1,189 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.